Fix PEP8 in test_expectmax
Fix PEP8 in test_expectmax

fixes #863

villalonreina/dipy,nilgoyyou/dipy,matthieudumont/dipy,villalonreina/dipy,StongeEtienne/dipy,FrancoisRheaultUS/dipy,matthieudumont/dipy,nilgoyyou/dipy,FrancoisRheaultUS/dipy,StongeEtienne/dipy